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500results about "Surface tension analysis" patented technology

Synchronous characterization method and device for capillary pressure and contact angle of microfluidic fluid interface

The invention discloses a capillary pressure and contact angle synchronous characterization method and device of a microfluidic fluid interface, and relates to the field of interface analysis and multiphase seepage in pore media, and the method comprises the following steps: based on a pre-configured pore, particle and fluid binary image, distinguishing and extracting a fluid-particle contact interface contour and an attack / defense fluid interface contour; fitting and determining the curvature radius of each fluid interface contour through a watershed region division algorithm and reordering smoothing of Fourier descriptors; generating a multi-level size pore space based on the pore binary image, and obtaining a pore overlook radius; calculating a necking angle in combination with the curvature radius and the multi-stage size pore space to obtain an apparent contact angle and an intrinsic contact angle; and calculating the capillary pressure of the attack / defense fluid interface by combining the curvature radius, the pore overlook radius, the chip depth and the interfacial tension. According to the invention, high-precision technical support is provided for micro-fluidic multiphase seepage research.
Owner:INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI

Supercritical carbon dioxide contact angle direct monitoring system and method

The invention belongs to the technical field of monitoring equipment, and discloses a supercritical carbon dioxide contact angle direct monitoring system and method.A first needle valve is connected with the bottom of a high-temperature and high-pressure reaction kettle, the other side of the first needle valve is connected with a supercritical carbon dioxide storage device, and a heater is arranged on the periphery of the columnar high-temperature and high-pressure reaction kettle; a sight glass is arranged on the side face of the high-temperature and high-pressure reaction kettle, a light source is arranged on the left side of the high-temperature and high-pressure reaction kettle, the top of the high-temperature and high-pressure reaction kettle is connected with a second needle valve, the other side of the second needle valve is connected with a water injection pump, and a CCD camera is arranged on the right side of the high-temperature and high-pressure reaction kettle and connected with a computer. The computer is connected with the high-temperature and high-pressure reaction kettle through the temperature sensor and the pressure sensor. According to the invention, the change of the contact angle of the supercritical carbon dioxide can be accurately monitored and analyzed in real time, and an effective tool is provided for researching the wettability of the supercritical carbon dioxide and the effects of anisotropy, cohesiveness, adsorptivity and the like of the surface of a material.
Owner:CHONGQING INST OF GEOLOGY & MINERAL RESOURCES

Water solution surface energy parameter testing method based on surface and interface tension method

The invention relates to the technical field of road engineering, in particular to an aqueous solution surface energy parameter testing method based on a surface and interface tension method, which comprises the following steps: firstly, carrying out surface tension testing on a to-be-tested aqueous solution to obtain a surface tension coefficient of the to-be-tested aqueous solution; then selecting two organic reagents, respectively adding the two organic reagents into the two aqueous solutions to be tested, fully standing to form two different organic reagent-aqueous solution contact interfaces, respectively carrying out interfacial tension tests on the two interfaces, and obtaining interfacial tension coefficients of the contact interfaces of the aqueous solutions to be tested and the two organic reagents; and finally, substituting the surface tension coefficient, the two interfacial tension coefficients and the known surface energy parameters of the two organic reagents into an equation set based on a GvOC model, and solving and determining the surface energy parameters of the aqueous solution to be detected. According to the invention, the surface energy parameters of aqueous solutions with different pH values can be accurately tested, so that the water stability of the asphalt mixture in water environments with different pH values can be accurately and quantitatively evaluated.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Correcting ambient capillary pressure curves to account for downhole reservoir conditions

Systems and methods are described for correcting ambient condition capillary pressure curves. In an example, the capillary pressure curve of a porous medium can be measured in non-reservoir conditions. Samples of the porous medium can be scanned at various confining pressures, and digital models of the scans can be created by a computing device. The computing device can simulate a porous plate experiment on the digital models to create a capillary pressure curve for each model. The computing device can calculate fitting equations for each capillary pressure curve according to capillary pressure points. The fitting equations can be averaged together and applied to the capillary pressure curve of the porous medium to correct for the non-reservoir conditions.
Owner:SAUDI ARABIAN OIL CO +1

Method for detecting surface defects of aluminum alloy plate with epoxy coating

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides a method for detecting surface defects of an aluminum alloy plate with an epoxy coating. The method comprises the following steps: applying an epoxy coating doped with a zinc yellow pigment to an anodic oxide film to construct a coating test piece with a color difference indication function, and placing the coating test piece in a coastal atmospheric environment for exposure sampling. In the detection process, the gloss loss rate, the chromatic aberration, the contact angle, the defect area proportion and the corrosion current density are collected, a dynamic correction coefficient is calculated according to the hydrolysis degree of the zinc yellow pigment, all parameter thresholds are adjusted in a self-adaptive mode, and a threshold set is constructed. And in combination with scanning electron microscope image segmentation and Tafel extrapolation analysis, multi-source indexes are fused to judge whether the coating is invalid. According to the method, the hydrolysis behavior of the zinc yellow pigment can be tracked in real time, the judgment standards of optical, morphology and electrochemical indexes are automatically corrected, and the accuracy and reliability of failure detection of the epoxy coating aluminum alloy plate under the coastal service condition are improved.
Owner:AIR FORCE UNIV PLA

Method and apparatus for determining surface wave data in liquids

The present disclosure relates to methods and apparatus for characterising an interaction between a stimulus and a liquid thin film. An aspect of the disclosure provides a spectroscopic ellipsometry apparatus for characterising an interaction between a stimulus and a liquid thin film, the apparatus comprising: a stimulator, configured to provide a stimulus to a liquid thin film disposed on a volume of liquid to generate a wave in the liquid thin film, the liquid thin film and the volume of liquid having an interface therebetween, light beam optics for illuminating an area of the liquid thin film with a light beam, the light beam having a first polarisation, and a light collector coupled to a detector for receiving the light beam after reflection by the liquid thin film, the light beam having a second polarisation after reflection by the liquid thin film; a wave measurement module coupled to the light collector and configured to provide surface wave data to characterise a Lucassen wave in the liquid thin film based on the second polarisation.
Owner:APOHA LTD

Optical filtering module device for high-temperature vacuum contact angle measuring instrument

The utility model relates to the technical field of contact angle measuring instrument parts, in particular to an optical filtering module device for a high-temperature vacuum contact angle measuring instrument, which comprises a shell, an aperture adjusting mechanism and a filtering adjusting mechanism. The light filtering adjusting mechanism comprises a mounting cover, a mounting plate, a plurality of light filters and a plurality of positioning assemblies, the aperture adjusting mechanism comprises a driving assembly, two mounting rings, two rotating assemblies and a plurality of separation blades, and by arranging the aperture adjusting mechanism and the light filtering adjusting mechanism, scattered light emitted by the light source can be converted into parallel light; the problem that the contact angle measurement precision is reduced due to the fact that the boundary of the liquid drop is fuzzy due to light scattering is effectively avoided, and the use requirement is met.
Owner:BEIJING HAKO TEST INSTR FACTORY

Method and device for measuring dynamic contact angle value of liquid on solid surface

PendingCN121521691ASurface tension analysisLiquid dynamicsMechanical engineering
The invention discloses a method and a device for measuring a dynamic contact angle of liquid on a solid surface. The method comprises the following steps: constructing a to-be-measured system containing a first liquid phase, a fluid phase and a solid phase; immersing the to-be-detected surface of the solid phase in the environment phase upwards or downwards; an end surface object is arranged opposite to the to-be-detected surface, and the two are immersed in the same environment phase; the relative distance and position of the two are adjusted, and a longitudinal fluid bridge is formed through the liquid adding device; the camera device obtains a fluid bridge interface contour image from the side surface; horizontally moving the surface of the end surface object or the solid phase, and applying transverse lateral dragging acting force to the fluid bridge to promote the fluid bridge to deform and contact the peripheral line to move or be about to move; and recording the time sequence change of the image, analyzing and calculating to obtain the time change relationship between the contact angle value and the three-phase contact point position value, and further determining the static, forward and backward contact angles and the contact angle hysteresis value. The method is simple and accurate, has wide applicability, and can cover reliable dynamic contact angle data measurement from hydrophilic to super-hydrophobic surfaces.
Owner:NINGBO NB SCI INSTR CO LTD

Visual measurement device and method for refrigerant liquid drops

The invention belongs to the technical field of refrigerants, and particularly relates to a visual measuring device and method for refrigerant liquid drops, and the device comprises a liquid drop sampling system, and a sampling cabin is connected with a capillary needle tube through a sampling valve, and the capillary needle tube is arranged along the gravity direction; a capillary needle tube of the high-pressure visualization system extends into an observation bin communicated with the sample injection bin; the visible windows are arranged on the opposite side walls of the observation bin, the observation platform is fixed in the observation bin and located between the visible windows and below the capillary needle tube, and the thermoelectric effect semiconductor is arranged on the observation platform; the pressure control system, the electric heating module and the semiconductor chilling plate are arranged on the sample injection bin, and the pressure micro-control unit is electrically connected with the two; the optical imaging system, the high-speed camera and the light source are arranged outside the visible window, and the computer is electrically connected with the two. Compared with the prior art, the problems that in the prior art, high-pressure sampling equipment which is high in cost and complex in operation is needed, and only the liquid drop contact angle can be measured are solved. According to the scheme, through the gravity action of the liquid working medium, sample injection in a high-pressure environment is achieved, and high-pressure sample injection equipment is not needed.
Owner:UNIV OF SHANGHAI FOR SCI & TECH

Shale hydrophilicity evaluation method based on drop stopping method

PendingCN120020526ASurface tension analysis
The invention discloses a shale hydrophilicity evaluation method based on a drop stopping method. The shale hydrophilicity evaluation method comprises the following steps: (1) preparing a shale sample; (2) collecting dynamic images of water drops on the surface of the shale sample at different moments based on a drop stopping method; (3) measuring contact angles of water drops on the surface of the shale sample at different moments by adopting a contact angle measuring instrument; (4) calculating volumes of water drops on the surface of the shale sample at different moments based on an image analysis method; and (5) drawing a change curve of the contact angle of the water drop on the surface of the shale sample at different moments and a change curve of the actual volume of the water drop, and evaluating the hydrophilicity of the shale. According to the method, the hydrophilicity of the fresh shale sample can be simply and quickly evaluated, and the defects that the wettability of the shale sample with extremely low porosity and permeability cannot be evaluated by a traditional Amott method and a traditional USBM method based on a flow experiment, the adaptability is poor, and even evaluation cannot be carried out are overcome.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1

Contact angle measuring instrument suitable for photosensitive material

The utility model discloses a contact angle measuring instrument suitable for a photosensitive material, which comprises a base, a movable objective table arranged on the base, a camera shooting assembly and a support, the camera shooting assembly and the support are respectively arranged on two opposite sides of a driving assembly, a liquid dropping unit is arranged on the support, and the contact angle measuring instrument also comprises a photosensitive excitation assembly arranged on the support, the light source I is arranged on the bracket and is matched with the camera component; the photosensitive excitation assembly comprises a lamp holder fixed to the support and a light source II detachably connected with the lamp holder. According to the contact angle measuring instrument suitable for the photosensitive material provided by the utility model, the photosensitive excitation assembly is arranged to excite the characteristics of the measured photosensitive material, so that the measured photosensitive material presents a real reaction state in the testing process, and the contact angle can be measured more accurately; meanwhile, the original positions of the light sources II with different wavelengths can be replaced according to experimental requirements, the uniqueness of the positions of the light sources II is controlled, and the experimental requirements of photosensitive materials are met.
Owner:SOUTHWEAT UNIV OF SCI & TECH

Surface performance evaluation device, surface performance evaluation method, and surface performance evaluation program

A surface performance evaluation device including memory and a processor coupled to the memory. The processor being configured to: acquire a captured image, which is a moving image of a test object on which a liquid is dispersed, and which is captured by a camera; quantify, based on the captured image that is acquired by the processor, a degree of diffusion of the liquid that is dispersed on the test object and diffuses; and evaluate a surface performance of the test object based on an index quantified by the processor.
Owner:TOYOTA JIDOSHA KK

Electronic oil pump rotating speed intelligent control system for new energy vehicle

The invention discloses an electronic oil pump rotating speed intelligent control system for a new energy vehicle, which relates to the field of electronic oil pump rotating speed intelligent control and comprises a data acquisition module, a fuel oil module, a component module, a working condition module and an execution module. According to the method, the conversion-demand degree of the fuel oil of the oil pump of the new energy vehicle is obtained by evaluating the conversion-demand degree of the fuel oil of the oil pump through the physicochemical characteristics, the injection parameters, the combustion sequence characteristics, the electrical characteristics and the quality parameters of the fuel oil, and the conversion-demand degree of a fuel oil supply system is obtained by analyzing the working characteristics of the parts; performing automobile driving, running and battery state judgment analysis on the working condition information to obtain an automobile working condition turning-on-demand value, and performing automobile electronic oil pump rotating speed overall state analysis on the turning-on-demand degree of oil pump fuel, the turning-on-demand degree of a fuel supply system and the automobile working condition turning-on-demand value; the electronic oil pumps in different comprehensive states are matched with corresponding revolution values to work, the revolution speed of the electronic oil pumps can be accurately adjusted, and the energy consumption of the oil pumps is reduced.
Owner:DAFENG HAINA MACHINERY

Method for rapidly measuring surface wettability of ore grains based on low-field nuclear magnetic resonance

The invention discloses a method for rapidly measuring the surface wettability of ore grains based on low-field nuclear magnetic resonance, and belongs to the technical field of wettability measurement. According to the method, contact angles of part of energy, metal and non-metal ore particles are respectively tested through a seat drop method, then a T2 relaxation spectrum is obtained through a low-field nuclear magnetic resonance test, then a T2 weighted average value T2g value at different wetting times is obtained, linear quantitative fitting is carried out on the T2g value at different wetting times and the wetting time, and the wetting time is calculated. Obtaining a slope value kT2g of the linear function; performing first-order linear fitting on the kT2g and a corresponding ore grain contact angle theta to obtain a relational expression between the kT2g and the contact angle theta, and obtaining the wettability of the to-be-measured wettability ore grains through the relational expression between the kT2g and the contact angle theta. The linear model between the slope value and the contact angle of the T2 weighted average and wetting time fitting function established by the method is accurate and reliable, the evaluation of the surface wettability of the ore grains can be completed in only 3 minutes, and the method has the advantages of rapidness, high efficiency and the like.
Owner:KUNMING UNIV OF SCI & TECH

Waterproof protection treatment method and application of cable sheath PVC (polyvinyl chloride) material

The invention belongs to the technical field of PVC material processing, and discloses a cable sheath PVC material waterproof protection treatment method and application, the method comprises the following steps: using carbon tetrafluoride as a working medium gas for plasma discharge, using a predefined plasma modification platform and combining a dielectric barrier discharge technology to carry out modification treatment on a PVC material, and obtaining a modified PVC material; the modified polyvinyl chloride material is obtained; carrying out physical and chemical property test on the modified polyvinyl chloride material to obtain a surface energy change state, carrying out hydrophilic angle test on the modified polyvinyl chloride material based on the surface energy change state, and regulating the hydrophilicity of the polyvinyl chloride material according to a hydrophilic angle test result; and sequentially carrying out pulse current attenuation test and breakdown voltage band test on the modified polyvinyl chloride material by utilizing a pulse current attenuation technology. Fluorination treatment is performed on the PVC surface through a CF4 plasma technology, so that the hydrophobicity and weather resistance of PVC are effectively improved.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1

Bionic regulation method for number of bounces of droplet on metal surface based on acoustic in-situ monitoring

The present invention discloses a bionic regulation method for a number of bounces of a droplet on a metal surface based on acoustic in-situ monitoring, which comprises the following steps: obtaining dynamic contact characteristics and acoustic properties of a solid-liquid interface of metal superhydrophobic surfaces with different surface information in the droplet bounce process based on an optical-acoustic synchronous in-situ testing system for droplet bounces; and obtaining a correlation among the metal superhydrophobic surface, the acoustic response and the droplet bounce behavior based on the dynamic contact characteristics and the acoustic properties of the solid-liquid interface, and machining and modifying a micro-nano structure of the metal surface by combining a coupled bionic concept according to the correlation. A scientific basis and a novel design method are provided for the bionic regulation of the number of droplet bounces over the metal surface.
Owner:JILIN UNIVERSITY

Alkali metal gas chamber anti-relaxation self-assembly molecular coating adsorption energy quantification method

The invention relates to an alkali metal gas chamber anti-relaxation self-assembly molecular coating adsorption energy quantification method, which finally realizes the physical quantification of the anti-relaxation coating adsorption energy by establishing a contact angle and surface topography collaborative characterization model and combining an adsorption-desorption dynamic formula, and is characterized by comprising the following steps: 1) establishing a contact angle and surface topography collaborative characterization model; depositing organosilane on a gas chamber glass substrate by adopting a liquid phase self-assembly method to form an anti-relaxation coating sample; step 2, selecting a plurality of measuring points on the anti-relaxation coating sample, dropping a 1 [mu] L ultrapure water liquid drop on each measuring point, determining a polarization retention angle of each measuring point according to the liquid drop height and the liquid drop substrate radius obtained by a contact angle measuring instrument, and scanning a local area of the corresponding measuring point by using an atomic force microscope (AFM), extracting an arithmetic mean value Ra of the surface roughness parameter and a root-mean-square value Rq of the surface roughness parameter as quantitative indexes of the polarization maintaining cross section; and step 3, taking free energy formed by the molecular layer of the coating as coating adsorption energy delta G.
Owner:BEIHANG UNIV +1

Experimental device for measuring rock wetting contact angle and measuring method thereof

The invention provides an experimental device for measuring a rock wetting contact angle and a measuring method thereof, and belongs to the technical field of rock physical property measurement, the experimental device comprises an ISCO constant-pressure constant-speed pump, a piston container, a control switch, a constant-temperature circulating system and an image processing system, the ISCO constant-pressure constant-speed pump is connected with the piston container through a first pipeline, and the piston container is connected with the control switch through a second pipeline; the ISCO constant-pressure and constant-speed pump is used for accurately injecting fluid at constant pressure and constant speed, the piston container is connected with the constant-temperature circulating system through a second pipeline and used for storing liquid, the constant-temperature circulating system is connected with a software interface of the ISCO constant-pressure and constant-speed pump and used for conducting experimental testing and adjusting temperature and pressure, and a control switch is arranged on the second pipeline. And the image processing system is connected with the constant-temperature circulating system and is used for calculating the wetting contact angle of the two-phase fluid in the shot image. The device provided by the invention realizes real-time dynamic monitoring of wettability under the conditions of different pore pressures, different pore diameters and various displacement media.
Owner:CHANGZHOU UNIV

Method for measuring flow properties of liquid and device used for droplet observation

PCT designated stage expiredWO2025060164A1Sustainable transportationDirect flow property measurement
A method for measuring the flow properties of a liquid and a device used for droplet observation. The method comprises: controlling a droplet to drop from a preset height to a substrate; obtaining a density, a maximum tip radius, a real-time tip height, and an initial tip height of the droplet on the substrate and a test duration from the droplet hitting the substrate to the end of measurement; determining the ratio of a tip height change value to the test duration as a first calculation coefficient, the tip height change value being the difference between the initial tip height and the real-time tip height; and, on the basis of the first calculation coefficient, the droplet density, the maximum tip radius, and the initial tip height, determining a calculated viscosity of the droplet. The present application can measure the calculated viscosity of droplets on the basis of changes in the tip height of the droplets over time, is distinctly different from the existing titration method, rotation method, vibration method and pipe method, and can obtain dynamic changes in the flow properties of droplets.
Owner:CCTEG COAL MINING RES INST

Experiment-numerical value-machine learning fusion-based in-oil liquid drop electric field dynamics modeling and regulation method

The invention discloses an experiment-numerical value-machine learning fusion-based in-oil liquid drop electric field dynamics modeling and regulation method, which comprises the following steps of: firstly, constructing a high-voltage electric field liquid drop experiment system, and testing oil liquid drop experiment data in oil; then establishing a multi-physics field coupling model, and describing deformation and flow field evolution of oil drops in oil under a strong electric field; and finally, constructing a BP neural network and optimizing an initial weight and a threshold value to realize rapid prediction of the deformation behavior of the oil drops in the oil under the action of the electric field. According to the method, an experimental characterization-numerical solution-machine learning optimization three-layer collaborative system is constructed, a whole-process closed loop from physical property determination, equation solution to algorithm prediction is realized, and droplet deformation, charge distribution and interface response are rapidly predicted under the conditions of different electric field intensities, temperatures and emulsifier concentrations; and active control of electric field behaviors can be realized through parameter reverse adjustment, and reliable modeling and optimization basis is provided for an electrowetting chip, a flexible EHD pump and a microfluidic liquid drop regulation and control system.
Owner:ZHEJIANG UNIV

DEVICE FOR IDENTIFYING THE NATURE OF A LIQUID FROM A DROP THEREOF

The invention relates to a system for identifying a liquid from data of an image of a drop (10) of this liquid on a reflective surface (12), comprising: a) means for estimating, from said image data, the contact angle and the capillary length of the drop placed on this surface; b) means for comparing the contact angle and capillary length estimations with known data of contact angles and capillary lengths of a drop of another liquid and for identifying the nature of the liquid of the drop to be identified. figure 4
Owner:INST NAT POLYTECHNIQUE DE TOU LOUSE +2

Layer-by-layer self-assembled gallium-lysozyme composite antibacterial stainless steel coating and application thereof

The invention provides a layer-by-layer self-assembled gallium-lysozyme composite antibacterial stainless steel coating and application thereof, and relates to the technical field of medical equipment. According to the composite antibacterial stainless steel coating, medical 316L stainless steel is used as a substrate material, a dopamine solution is used as a raw material, Tris salt is added to initiate a polymerization reaction of dopamine, and a polydopamine film is formed on the surface of the stainless steel; the preparation method comprises the following steps: carrying out Michael addition reaction on an easily oxidized catechol group and lysozyme containing amino and sulfydryl in an aerobic environment to form stable covalent linkage, thereby preparing the lysozyme-loaded polydopamine composite membrane. In the invention, the antibacterial composite coating aims to effectively kill biofilm embedding bacteria and prevent bacterial adhesion and biofilm formation on the surface of an implant under the condition of not hurting an organism, so that the antibacterial property of the implantable stent is improved, and the problem of clinical postoperative explosive infection of the implant is solved; and more thoughts and means and beneficial exploration are provided for treatment of chronic refractory inflammation caused by biological membranes.
Owner:THE FIRST AFFILIATED HOSPITAL OF MEDICAL COLLEGE OF XIAN JIAOTONG UNIV

Cleaning agent quality detection and analysis system based on artificial intelligence

The invention relates to the technical field of cleaning agent quality detection, in particular to a cleaning agent quality detection and analysis system based on artificial intelligence, which comprises a quality detection and analysis platform, a database, a physical evaluation unit, a non-use evaluation unit, a chemical component quality unit, a use evaluation and analysis unit and a display response unit, according to the invention, quality analysis is carried out preliminarily from the perspective of physical detection and chemical detection of the detected sample, and physical quality evaluation interaction analysis is carried out in an information progressive manner, so that the physical quality detection accuracy and reliability of the detected sample can be improved; component deviation verification feedback analysis is performed on the basic component data from the perspective of chemical detection, so that whether the quality of the detected sample reaches the standard or not is judged in a non-use mode, quality detection analysis is performed from the perspective of the use effect, the quality analysis result of the detected sample can be further verified and fed back, and the detection accuracy is improved. The quality analysis error risk of the whole detection sample is reduced.
Owner:GUANGZHOU GONGDA TECH CO LTD +1

Method of robust surfactant screening for foam applications

Screening multiple surfactants is performed by a screening method including passing foam compositions comprising a surfactant through a porous media while measuring pressure drop across the porous media until a first steady state pressure drop is achieved. Magnitude and frequency in oscillations of the first steady state pressure are measured. A gas is injected through the porous media while measuring the pressure drop across the porous media until a second steady state pressure drop is achieved. Magnitude and frequency in oscillations of the second steady state pressure drop are measured. Foam stability is determined based on the first steady state pressure drop, second steady state pressure drop, and magnitude and frequency of oscillations during the first and second steady states. Secondary oil recovery may include injecting a foam composition into an oil-containing reservoir, wherein the foam composition is based on results of the screening and properties of the oil-containing reservoir.
Owner:SAUDI ARABIAN OIL CO

Viscosity and surface tension measurement using resonance of levitated droplets

PCT designated stage expiredWO2025106857A1Material analysis using sonic/ultrasonic/infrasonic wavesFlow propertiesPosition sensorElectrostatic levitation
Various examples are provided related to measurement of viscosity and surface tension in levitated liquid droplets. In one example, a method includes levitating a sample using electrostatic levitation; determining a measured resonance frequency of the sample by an analysis of a plurality of captured images, the measured resonance frequency based upon a maximum response deviation of the levitated sample at a mode of oscillation; determining a decay constant of the sample associated with the measured resonance frequency; and determining a viscosity of the sample based at least in part upon the decay constant of the sample. In another example, a system includes electrodes; a position sensor; and a camera device. A computing device can cause the system to levitate a sample using the method or variations thereof.
Owner:UNIV OF FLORIDA RESEARCH FOUNDATION INC +2

Device for measuring surface tension coefficient and air viscosity coefficient based on bubbles

The utility model discloses a device for measuring a surface tension coefficient and an air viscosity coefficient based on bubbles, and mainly solves the problems that the conventional device for measuring the surface tension coefficient and the air viscosity coefficient is mutually independent and the experiment cost is relatively high. The device comprises a buffer, a variable pressure intensity device connected with the buffer, a thin tube assembly, a bubble hole assembly, a barometer, a sealing piece connected with the thin tube assembly, a backlight source arranged on one side of the bubble hole assembly, imaging equipment arranged on the other side of the bubble hole assembly, and image data processing equipment connected with the imaging equipment. Through the design, two simple and independent experiments in the traditional sense are integrated into an experiment with rich content through the bubble which is an interesting bridge and a new experiment method generated by the bubble, the experimental device has reliable theoretical basis and teaching value, the teaching experiment method is expanded, and the experiment efficiency is improved. And students can be guided to carefully research fluid mechanics knowledge behind the bubble phenomenon.
Owner:NANKAI UNIV +1

Method for measuring 3D dynamic contact angle in gap flow field in real time based on interference measurement

The invention discloses a real-time measurement method for a 3D dynamic contact angle in a gap flow field based on interference measurement. Comprising the steps that a 3D dynamic contact angle real-time measurement optical platform is built, a reference interference image is collected, and reference interference image phase distribution is obtained according to the reference interference image; an interference image of the gap flow field to be measured is collected in real time, interference image phase distribution is obtained according to the interference image at the current moment, and liquid level height distribution at the current moment is obtained according to the interference image phase distribution at the current moment and the reference interference image phase distribution; obtaining a gas-liquid-solid contour line according to the liquid level height distribution at the current moment; and obtaining the contact angle at the current moment according to the liquid level height distribution and the gas-liquid-solid contour line at the current moment. According to the invention, 3D measurement and real-time measurement of the contact angle can be realized at the same time, the problem that 3D measurement and real-time measurement cannot be realized at the same time in the conventional test method is solved, and the method is also suitable for contact angle measurement of irregular liquid drops or flow field gas-liquid interfaces.
Owner:ZHEJIANG UNIV

Displacement fluid and shale rock imbibition law numerical simulation method and system

The invention relates to the technical field of model construction, in particular to a displacement fluid and shale rock imbibition law numerical simulation method and system. According to the method, by quantitatively analyzing the linear correlation degree of granularity and experimental capillary constant distribution and the disturbance degree of local feature points, regularization parameters of a regression algorithm are dynamically adjusted, and on the basis of accurately-calibrated capillary constants, a contact angle is determined by combining permeability characteristic data of probe liquid, so that the permeability of the probe liquid is determined. According to the method, shale surface free energy is obtained through surface energy component theoretical model decoupling, the interface action state of displacement fluid, shale and crude oil is reflected through a three-phase contact angle determined through a three-phase equilibrium relation, and the adhesion work needed by shale oil stripping is obtained. According to the method, the high-precision fitting model of the granularity and the capillary constant is established, and the surface energy component theory is combined, so that more accurate calculation of the shale oil stripping adhesion work is realized, and a reliable numerical simulation basis is provided for improving the shale oil recovery ratio.
Owner:DAQING OILFIELD CO LTD +1

System for evaluating the hydrophobicity grade of energy equipment superhydrophobic surfaces

This invention discloses a hydrophobicity rating system for superhydrophobic surfaces of energy equipment, relating to the field of hydrophobicity rating technology. The system includes a data acquisition module, an optimal parameter combination module, a sample preparation module, a hydrophobicity quantification and evaluation module, a test closed-loop calibration module, and a hydrophobicity rating classification and output module. These modules are interconnected, and through their collaborative operation, the system quantifies, performs closed-loop calibration, and classifies the hydrophobicity index of superhydrophobic samples of energy equipment with different microstructures. The closed-loop calibration process fully considers both anti-icing and weather resistance, significantly improving the accuracy and generalization ability of the hydrophobicity rating results. This solves the problems of inaccurate evaluation results and inability to adapt to extreme field conditions caused by traditional evaluation systems relying solely on conventional laboratory environments, single physical tests, and empirical thresholds for rating. This enhances the intelligence level of hydrophobicity rating evaluation for superhydrophobic surfaces of energy equipment.
Owner:CHONGQING UNIV